Monoazo-dyestuffs and their production



Patented Nov. 21, 1933 UNITED STATES PATENTLOFFICE a Item, 1931 By this invention valuable dyestuffs suitame for dyeing wool and silk are made by combining a diazo compound of an amine of the general formula:

NYH: V

1 I v X1 S-OzN X2 .Wherein R represents an aromatic radical and 5 X1 and X2 represent hydrogen or are the one an alkyl, the other a radical of the benzene series, with an arylsulpho-(N) or benzoyl- (N) deriva tive of a 1-amino-8-hydroxynaphthalenedisulv V phonic acid. Thenew dyestuffs dye wool and silk in beautiful red shades; besides good fastness to fulling and light they have a particularly good fastness towards sea-water, in which respect they are superior to the dyestuffs described in German specification No. 235,775.

The new dyestuifs have the following general formula: V

/H OR OH N I N: q

NaOsS SOsNa 7 V wherein R represents an aromatic radical, X1 and W X2 represent the same or different aliphatic, araliphatic or aromatic radicals or hydrogen and Ac an arylsulphoor benzoylgroup.

The following example illustrates the invention:

i 36.8 kilos of 2-amino-diphenylether-4-sulphonic acid-N-ethylanilide (a white crystalline product of melting point 112 C. which can be obtained by treating 2-nitrochlorobenzene-4-sulphochloride with monoethylaniline, condensing l with sodium phenolate the 2-nitrochlorobenzene- 4-sulphonic acid-N-ethylanilide thus obtained and reducing the condensation product by means of iron) are diazotized and the diazo solution is allowed to run at 0 C. into an aqueous solution of 47.3 kilos of paratoluenesulpho-l-amino-8-hy- 6 Claims. (01. 26092).

droxynaphthalene 3: 6 disulphonic acid containing an excess of sodium acetate, whilst well stirring. The reaction mixture is neutralized by the gradual addition of a solution of sodium carbonate. When coupling is complete the whole is heated and the dyestuif is salted out, filtered and dried.

The dyestuff thus obtained is a red powder which is soluble in water to a vivid red solution and in concentrated sulphuric acid to a dull bluered solution. It dyes wool and silk, very clear red shades of very good fastness to light and fulling and of excellent fastness'to sea-water.

Quite similar dyestuffs are obtained if instead of 2-amino-diphenylether-4-sulph0nic acid-N- ethylanilide there isrused, for example,"2'-aminodiphenylether-sulphonamide, ,2-amino-diphenylether-sulphonanilide, 2 amino diphenylethersulphonorthotoluidide or Z-aznino-Zimethyldiphenylether-4-sulphonanilide.

Instead of paratoluenesulpho-(N) l'-amino8- hydroxy-naphthalene-3:G-disulphonic acid there may be used, for example, benzene-sulpho(N)- 1 amino-8'-hydroxynaphthalene-3 fi-disulphonic acid or paratoluene-sulpho(N)- or benzene sulpho (N) -1-amino-8-hydroxynaphthalene-4 6- disulphonic acid.

Dyestuffs having the same valuable properties 1 and having a somewhat bluer shade are obtained if instead of an aryl-sulphon(N) -1-ami'no-'8- hydroxynaphthalene-disulphonic acid there" is used a benzoyl(N) -1' -amino-8 -hydroxynaphthalene-disulphonic acid. t

What I claim is:

1. A process for the manufacture of monoazodyestuffs, consisting in coupling a diazo-compound of an amine of the general formula:

wherein R represents an aromatic radical of the benzene series and X1 and X2 represent hydrogen or are the one an alkyl, the other a radical of the benzene series, with an acidyl-(N) derivative of a 1-amino-8-hydroxynaphthalene-disulphonic acid, wherein acidyl represents an arylsulpho or a benzoyl group.

2. A process for the manufacture of monoazo-dyestuffs, consisting in coupling a diazocompound of an amine of the general formula:

wherein R represents an aromatic radical of the benzene series and X1 and X2 represent hydrogen or are the one an alkyl, the other .a radic'alfofthe benzene series, with an arylsulpho-(N) derivative of a 1-amino-8-hydroxynaphthalene-disulphonic 01 v r v i 3. A process for the manufacture of monoazodystuffs, consisting in couipling a diazo-compound of an amine of the general formula:

wherein R represents an aromatic radical of the benzene series'and X1 and X2 represent hydrogen or are the one an alkyl; the other a radical of the benzene series, with a benzoyl-(N),-derivatiye of a I-amino-8-hydroxynaphthalene disulphonic acid.

4. A process for the manufacture of monoazodyestuffs, consisting in coupling diazotized '2- amino-diphenylether 4 sulphonic acid (N) ethylanilide with paratoluene-sulpho-1-amino-8- hydroXynaphthalene-3:G-disulphonic acid.

5. The monoazo-dyestuffs corresponding with the following general formula:

BEBNHARD, RICEARR 

